The MassTransit Engine may inadvertently shut down, and will not properly restart. Within the Application Log of the Windows Event Viewer, the following error message may be displayed:

SA_Exception[xxxx]: DB_Files_Edit: Incorrect key file for table 'tablename'; try to repair it.
Commonly, tablename may be referenced as 'dfiles'

Create special registry keys to fix this issue


  1. After you install Acronis Cyber Backup 12.5 on the machine, certain USB drives/keys are not instantly detected. It takes 2-5 minutes for the drive to acquire a letter and be accessible in Windows Explorer.
  2. If you stop Acronis Managed Machine service, the same USB drives are detected instantly.


Hardware incompatibility: some specific devices incorrectly process standard commands issued by Acronis product components.


Activation makes sure you are using Acronis Cyber Backup in the compliance with Acronis Licensing Policy and Acronis end user license agreement (EULA) [pdf]. In most cases, one purchased Acronis Cyber Backup license key allows protection of one physical machine.

This article applies to:

  • Acronis Cyber Protect 15 Update 3 (Build 28035 or later)


You have activated a Management Server as described in product documentation

When you try to manage licenses in Acronis Cyber Protection service console in the cloud, License usage tab is not shown under Settings:

This article describes upgrade procedure from Acronis OEM versions.

This article describes how to change the delay time and key for starting Acronis Startup Recovery Manager.

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Acronis True Image 2021 Editions

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Acronis True Image 2020 Editions


You installed Acronis Cyber Protect Home Office and signed in.

After clicking Enter serial number, you submit a short subscription key (16 symbols).

After you press Activate, the activity indicator runs for some time, then Activate and Cancel buttons reappear. No error message is shown.